The feud between “Real Housewives of Beverly Hills” stars Lisa Vanderpump and Brandi Glanville is starting to get ugly.

After Glanville trashed her co-star’s pal on “Watch What Happens: Live” earlier this week, Vanderpump hit back in an interview with “Us Weekly.”

“I have endured so many things from Brandi Glanville over the last few months,” she said. “Going on [talk show] ‘Bethenny,’ her talking to Australian magazines, constant putdowns on Twitter – I’m crooked, I’m weak, I’m this, I’m a puppeteer, I’m all these things. I’ve never retaliated because that’s not who I am.”

The former friends’ relationship hit the skids while filming the upcoming fourth season of their Bravo reality series, but Vanderpump says the fight isn’t just for show.

“And if it comes to the point where we’re in a b**** fest, then I don’t want to be any part of the show,” she told “Us.” “I’m not going to involve myself in a public slanging match. However, when she says something so egregious about my friend Mohamid Hadid – an it’s gone everywhere – I don’t appreciate it at all.”

On Monday’s episode of “WWHL,” Glanville accused “Real Housewives of Miami” star Joanna Krupa of having an affair with Hadid, who happens to be the ex-husband of “RHOBH” co-star Yolanda Foster.